@article{Chen2024, 
author = {Jieshuangyang Chen and Jie Lei and Jinwei Zhou and Xuanfeng Chen and Rongyu Deng and Mingzhi Qian and Ya Chen and Feixiang Wu},
title = {Polysulfides adsorption and catalysis dual-sites on metal-doped molybdenum oxide nanoclusters for Li-S batteries with wide operating temperature},
year = {2024},
journal = {Nano Research},
volume = {17},
number = {11},
pages = {9651-9661},
keywords = {lithium-sulfur batteries, wide temperature, separator modification, doped molybdenum oxide, adsorption and catalysis dual-sites},
url = {https://www.sciopen.com/article/10.1007/s12274-024-6879-8},
doi = {10.1007/s12274-024-6879-8},
abstract = {The development of electrocatalysts with high catalytic activity is conducive to enhancing polysulfides adsorption and reducing activation energy of polysulfides conversion, which can effectively reduce polysulfide shuttling in Li-S batteries. Herein, a novel catalyst NiCo-MoOx/rGO (rGO = reduced graphene oxides) with ultra-nanometer scale and high dispersity is derived from the Anderson-type polyoxometalate precursors, which are electrostatically assembled on the multilayer rGO. The catalyst material possesses dual active sites, in which Ni-doped MoOx exhibits strong polysulfide anchoring ability, while Co-doped MoOx facilitates the polysulfides conversion reaction kinetics, thus breaking the Sabatier effect in the conventional electrocatalytic process. In addition, the prepared NiCo-MoOx/rGO modified PP separator (NiCo-MoOx/rGO@PP) can serve as a physical barrier to further inhibit the polysulfide shuttling effect and realize the rapid Li+ migration. The results demonstrate that Li-S coin cell with NiCo-MoOx/rGO@PP separator shows excellent cycling performance with the discharge capacity of 680 mAh·g−1 after 600 cycles at 1 C and the capacity fading of 0.064% per cycle. The rate performance is also impressive with the remained capacity of 640 mAh·g−1 after 200 cycles even at 4 C. When the sulfur loading is 4.0 mg·cm−2 and electrolyte volume/sulfur mass ratio (E/S) ratio is 6.0 μL·mg−1, a specific capacity of 830 mAh·g−1 is achieved after 200 cycles with a capacity decay of 0.049% per cycle. More importantly, the cell with NiCo-MoOx/rGO@PP separator exhibits cycling performance under wide operating temperature with the reversible capacities of 518, 715, and 915 mAh·g−1 after 100 cycles at −20, 0, and 60 °C, respectively. This study provides a new design approach of highly efficient catalysts for sulfur conversion reaction in Li-S batteries.}
}